Does it have to do with accuracy?
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Digital and mechanical (non-digital) scales can have the same accuracy if properly designed and maintained. But both types can also be designed cheaply for not so accurate applications. There is a different design for legal for trade applications (say buying produce at the store), and non-legal for trade applications (say you doctor’s office scale). There is also a speed of weighing factor where digital scales can generally provide a faster weight reading. Your doctor’s office scale needs neither legal for trade accuracy nor speed of weighing, so a balance beam may be less expensive, and/or more reliable than digital.
As someone else pointed out there is a bit of a dramatic effect with the mechanical scales as well.
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